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      <title>从无感认证到完美用户体验的JWT实践 - 交互式测验</title>
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    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>从无感认证到完美用户体验的JWT实践 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
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      <script>
        const quizData = [
  {
    "question": "根据文档，与传统的单Token认证方案相比，双Token机制最核心的优势是什么？",
    "options": [
      "完全消除了服务端的状态管理，实现了纯无状态认证。",
      "在安全性和用户体验之间取得了更好的平衡。",
      "简化了前端的开发逻辑，不再需要处理Token。",
      "支持更多的加密算法，提高了Token本身的安全性。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "双Token机制的核心思想是通过结合短期的AccessToken和长期的RefreshToken来解决单Token方案的固有矛盾。短期的AccessToken保证了即使Token被盗，攻击窗口期也非常短，从而提高了安全性；而RefreshToken的自动刷新机制则避免了用户频繁重新登录，保障了流畅的用户体验。",
    "source": "文档中「2.4 方案的技术优势」部分，特别是第一点“平衡安全与体验”",
    "hint": "文档提到，传统的短期Token体验差，长期Token风险高，双Token方案正是为了解决这个“哲学问题”。"
  },
  {
    "question": "在双Token认证机制中，RefreshToken的主要职责是什么？",
    "options": [
      "用于每次API请求的权限验证。",
      "携带用户的详细个人信息以供前端展示。",
      "在AccessToken过期后，用于安全地获取一个新的AccessToken。",
      "在多个子系统间实现单点登录。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "RefreshToken的权限被严格限制，其唯一用途是在AccessToken失效时，作为一个安全的凭证向认证服务器换取新的AccessToken。它不参与日常的API请求验证，这种职责分离遵循了最小权限原则，极大地增强了系统的安全性。",
    "source": "文档中「2.2 AccessToken与RefreshToken的职责划分」部分",
    "hint": "文档中将AccessToken和RefreshToken比作“门禁卡+钥匙”的组合，想一想“钥匙”的特定用途是什么。"
  },
  {
    "question": "根据文档描述的“无感刷新”工作原理，当客户端使用一个已过期的AccessToken请求API时，通常会发生什么？",
    "options": [
      "API网关会自动放行该请求，但会在响应中提示Token已过期。",
      "客户端应立即清除所有凭证并强制用户跳转到登录页面。",
      "API网关会返回一个错误（如401 Unauthorized），客户端收到后会尝试使用RefreshToken获取新AccessToken。",
      "客户端会直接使用RefreshToken重新发起刚才失败的业务请求。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "“无感刷新”的标准流程是：1. 客户端用AccessToken访问API；2. 服务器/API网关发现Token过期，返回401错误；3. 客户端的请求拦截器捕获到401错误，自动发起一个携带RefreshToken的刷新请求；4. 成功获取新AccessToken后，用新Token重新发起之前的业务请求。整个过程对用户透明。",
    "source": "文档中「2.3 无感刷新的工作原理」和「4.2 核心流程时序图」的“Token刷新流程”部分",
    "hint": "思考一下客户端是如何“知道”AccessToken需要刷新的，这通常是通过一次失败的API请求来触发的。"
  },
  {
    "question": "为了有效防范XSS（跨站脚本攻击）窃取Token，文档推荐的最佳实践是什么？",
    "options": [
      "将AccessToken和RefreshToken都存储在浏览器的localStorage中。",
      "将RefreshToken存储在设置了httpOnly属性的Cookie中。",
      "对所有存储在前端的Token进行客户端加密。",
      "将AccessToken存储在内存中，RefreshToken存储在sessionStorage中。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "将RefreshToken存入httpOnly Cookie是关键的安全措施。`httpOnly`属性可以阻止页面上的JavaScript代码访问该Cookie，因此即使网站存在XSS漏洞，攻击者也无法通过脚本窃取到这个至关重要的RefreshToken，从而无法长期冒充用户。",
    "source": "文档中「3.2 潜在的安全风险及防范」部分的“XSS攻击”防范措施",
    "hint": "文档中明确指出了针对XSS攻击的防范措施，关键在于让JavaScript无法访问到某个关键的Token。"
  },
  {
    "question": "在微服务架构下，文档建议由哪个组件来统一处理AccessToken的验证？",
    "options": [
      "每个微服务独立验证，共享密钥即可。",
      "数据存储层（如Redis），通过查询Token是否存在来验证。",
      "认证服务（Auth Service），所有请求都先经过它。",
      "API网关（API Gateway），作为所有请求的入口统一校验。"
    ],
    "correctAnswerIndex": 3,
    "explanation": "在微服务架构中，API网关是系统的统一入口。将Token验证、鉴权等安全逻辑集中在API网关层，可以避免在每个下游微服务中重复实现相同的代码，实现了安全策略的集中管理。验证通过后，网关可以将解析出的用户信息（如用户ID）安全地传递给后端服务。",
    "source": "文档中「5.3 微服务架构下的应用」部分的“集中式验证”",
    "hint": "文档在系统架构设计中提到了一个专门用于拦截请求、进行初步处理的“门面”层。"
  },
  {
    "question": "当需要紧急撤销某个用户的会话时（例如发现Token泄露），双Token方案通常如何操作？",
    "options": [
      "等待该用户的所有AccessToken自然过期。",
      "修改JWT签名密钥，使所有用户的Token全部失效。",
      "在服务端将该用户关联的RefreshToken加入黑名单或直接删除。",
      "客户端主动删除本地存储的AccessToken。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "双Token方案便于实现Token撤销。由于AccessToken的有效期很短，我们只需关注如何让RefreshToken失效。服务端可以维护一个RefreshToken的黑名单，一旦将某个RefreshToken加入黑名单，该用户就无法再用它来刷新获取新的AccessToken，从而达到了强制下线的目的。这比处理长效的、无状态的单JWT要灵活得多。",
    "source": "文档中「3.3 Token泄露的应急处理」部分的“单用户撤销”",
    "hint": "思考一下，要阻止用户“续期”他的会话，应该让哪个关键凭证失效？"
  },
  {
    "question": "针对移动应用（Mobile App）的特点，文档指出了与Web端不同的Token存储建议，以下哪项是正确的？",
    "options": [
      "与Web端完全相同，使用httpOnly Cookie来存储RefreshToken。",
      "因为移动应用没有浏览器，所以只能将Token明文存储在本地文件中。",
      "使用操作系统提供的安全存储机制，如iOS的Keychain或Android的EncryptedSharedPreferences。",
      "将Token存储在应用的内存中，每次启动App时都要求用户重新登录。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "移动应用环境与Web浏览器不同，它们无法使用httpOnly Cookie。为了安全地持久化存储Token（尤其是RefreshToken），应该利用操作系统提供的原生安全存储功能，如iOS的Keychain或Android的EncryptedSharedPreferences。这些机制能为敏感数据提供加密存储，保护其免受未授权访问。",
    "source": "文档中「5.2 移动应用的适配方案」部分",
    "hint": "移动操作系统为开发者提供了一些特殊的、用于存储敏感信息的API。"
  }
];
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        let score = 0;
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            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

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                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
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                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  